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AR# 52176

MIG 7 Series DDR3 - 48-bit design unable to fit into two HP banks

Description

When targeting a 48-bit DDR3 interface, it is possible to fit this into two HP banks. However, when targeting the xc7k70t, the MIG 7 Series Bank Selection page prevents the interface from being placed into two HP banks while retargeting to a larger part allows this configuration.

Solution

To work around this issue, generate a MIG 7 Series design targeting the larger device with the same package type, then generate a MIG 7 series design targeting the xc7k70t using Fixed Pin Out mode in the interface, and import the UCF pinout from the larger device.